Thermometer.



PATENTED PEB. 18, 1908.

E. lKBSSLING. THERMOMETER.

APPLICATION FILED AUG. 2, 1905.

INVENTUR Edam/@Mig ATTORNEY EDWARD KESSLING, 0F BROOKLYN, NEW

YORK.

THERMOMETER.

Specicaton of Letters Patent.

Patented Feb. 18, 1908.

Ajplieati'on filed August 2. 1905. Serial No. 272.341.

To. all whom it mag/oncem:

Be it known that I, EDWARD KEssLiNG, a citizenof the United States, land a resident of Brooklyn, inthe county of Kings and State of New York, have invented certain new and useful Improvements in Thermometers, of which the following is a specification. l

The invention relates to improvements in high grade maximum indicating thermometers, and consists in the novel features herethe thermometer, detect at inafter described and particularly pointed out in the claims.

The object of the invention is to produce a highly eflicient and durable maximum thermometer for use in indicating high temperatures. High grade used in various manufactures in which liquids are heated tp hightemperatures, such as in breweries and he like, and due to the conditions under which the thermometers are used, the construction should be'particularly durable.

A further important feature ofmy invention is the provision of means for indicating the temperature to-whicli the liquid has beenl raised and of fixing the indication so that it cannot be changed by an employee, and of providing a locked casing for the upper end or head of the thermometer, the key to this casing: to be held by a yperson in authority and not by an employee actually engaged in the work. Y

lt has been frequently found that an employee, due to carelessness or otherwise, will destroy the value of the liquid by allowing the same to reach too high a temperature reached such temperature, and one of the purposes of my invention is to guardagainst all such contingencies by providing a maximum indicating thermometer and inclosing the same within a locked casing, so that at any special time the superintendent or head of a factory or brewery may, by examining once whether the liquid had reached the correct temperature or has risen above the same.

The invention Vwill be fully understood from .the detailed description hereinafter prev sented, reference being panying drawings, in which: Y

FigureI is a front elevation, partly broken t ermometer constructed -in accordance with thermometers are the liquid had wardly within the had to the accomi 'Ei away, of a high grade maximum indicating "155. h

view of the lower portion of the leg of same; Fig. 3 is a transverse section through the upper or head portion of thel thermometer on the dotted line 3-3 of Fig. 1;'Fig. 4 isa central vertical section' through a part of the upper portion of the thermometer Fig. 5 is a central vertical section through the lower portion of the leg Fig. 'is 'a horizontal 4section of same on the dotted line 6-6 of Fig. 5.

In the drawings, 10 indicates the upper or head portion of the thermometer, 11 the leg portion of same, and 12 an intermediate flanged part or hub which serves as a base for the portion.10 and receives the upper end of the leg portion 11. The upper or head portion 1() is in the form of a shallow .casing comprising a back 13 of double-incline form,

va door 14 hinged to said back 13 and containing a glass panel 15 and a lower tubular stem 16 threaded at its lower end and screwed into a suitable threaded socket formed in the hub 12, the said door 14 being formed with a suitable hasp 17 to pass upon a staple 18 carried by the back 13 and adapted to receive a pad-lock 19, the key to which will be held by someone in authority, The door 14 is in the form of a-frame closely fitting the back 13 and recessed from its inner side to receivethe glass panel 15, whereby when the -door is locked in its closed position, a workman would be excluded from access to the chamber formed within the casing. The hinges by which the door 14 is secured at one edge to the back 13 are denoted by the numeral 20.

The glass thermometer tube extends upchamber formed by the back 13 and door 14 and is disposed at an intermediate point between the .two inclined walls of said back, upon one of which walls I provide the index plate or readings 21, while upon the .other of said walls I apply three horizontal indicating lines marked H, C, "L", respectively, denoting high,

correct, low, these indicating marks and letters being provided to guide a workman in securing the proper temperature in some certain liquid under treatment. The glass thermometer tube will contain mercury, de-

noted by the numeral 22, and in its upper or head end 'said tube will contain a maximum indicator 23, which due to the presence of a Abody of'liquid 24 above the mercury column will become arrested at any point to which it may be moved by: the mercury, said maxlof the thermometer, andy the door 14 is opened and said indicator 1s p drawndownwardly 'by means ofa magnet.

The leg of the fithermometer comprises a tube which is screwed into the lower end of the hub 12, and within the lower end of this tube 25 is screweda hollow plug 26 having an annular shoulder 27 which abuts against the 'lower edge of said'tube but does not project laterally beyond the same. The plug 26 is formed with a section projecting downwardly below the tube 25 and being of the same diameter as the upper section of the plug, and upon this downwardly projecting section is screwed aperforated metal tube 28 which is open' at its lower end and within which is confined a steel tube 29 containing a mercury bath 30 and inclosing the bulb 31 of the glass thermometer tube, the latter extending from within the tube 2 9 upwardly through the nut 26, tube 25, hu`b 12 and stem 16 into the chamber formed in the head portion or casing. The tube 29 is of steel and has a threaded upper end which is screwed into the lower end of the downwardly projecting section ofthe plug 26, as shown-in Fig. 5. The steel tube 29 constitutes a very durable protective casing for the bulb 31 and forms a receptacle for the conducting mercury bath 30. The hollow plug 26 has a confining inwardly projecting flange at its upper end and is packed with asbestos or other suitable material above said plug will also preferably be packed with asbestos or other convenient material which will extend upwardly through the hub 12 and fill thelstem 16 around the glass thermometer tube. of the plug 26 results in the ong legof the instrument being of uniform diameter throughout.

The method of using the thermometer will be substantially understood without further description. It may be said, however, that before the thermometer is given to the workman` the maximum indicator 23 will be drawn downwardly from the position at which it should indicate the maximum temerature and the door 14 will be closed and ocked. Thereafter in the use of the thermometer the expansion of the mercury in the glass tube will` cause the maximum indicator 23 to ascend, and the construction is such that the' said indicator-will remain in the highest position to which it maybe pushed by the expanding mercury. The superintendent or other person in authority will, at the projpr time, examine the thermometer to see W liquid up to the requisite temperature', this as before,

32, and the tube 25A The special form ether the workman has brought the v @raar/a bein indicated to him through the glass pane 15. Prior to subsequent o eratlons, the superintendent or personin aut oritywill unlock and open the door 14 and by means of. a magnet draw the indicator 23 downwardly,

so that upon further inspection' after the repeated use of the instrument he may determine whether the liquid had I reached the requisitetemperature. The fact that the glass tube and indicator 23 are confined within a locked casing revents the workman from manipulating t e indicator 23 and concealing the degree of temperature given to the liquid, and tzhis isy a very important consideration in many cases, because it is probable that the liquid would be spoiled if the temperature exceeded a ycertain egree or did not reach a certain degree. In the absence of the locked door 14, the workman might manipulate the indicator 23,'but with said door locked and the key held by the superintendent the danger of deception is diminished.

The construction as a whole is 'of durable character and convenient of manufacture.

What I claim as my invention `and desire to secure by Letters-Patent, is

1. A high grade thermometer comprising the long leg portion, a casing at the upper end thereof havmg inclined walls and a hinged doorprovided with a glass anel set -into the door from' the inner side t ereof and a lock and key for securing the doorfone of said inclined walls bearing the readings and the other horizontal index lines marked H C and. L respectively, denoting high, correct and low, respectively, to guide the operator, and the straight glass thermometer tube extending upwardly through said leg portion and into said casing; -substantially as set forth.

2. A high grade thermometer having the long tubular leg, the hollow lug screwed into the same and' having ashoufder to engage but not project beyond the lower edges of said leg and also a lower threaded section of the same diameter as the upper section of j said plug, the perforated tube screwed upon said ower section and corresponding in diameter with the main tubular le and the metal casing for the mercury-bat screwed into said plug and inclosing the bulb; substantially as set forth.

Signed at New York city, inthe county of, New -York and State of INew York, this first 1 day of August, A. D. 1905. i

EDWARD KESSLING. Witnesses:

JACOB SAULEDER, J AMES CowLrNG; 

